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王 悦,许文勇,刘 娜,郑 亮,袁 华,李 周,张国庆.喷射成形GH738合金热变形特性及微观组织演变[J].稀有金属材料与工程(英文),2018,47(3):878~883.[Wang Yue,Xu Wenyong,Liu Na,Zheng Liang,Yuan Hua,Li Zhou,Zhang Guoqing.Deformation Characteristic and Microstructure Evolution of Spray Formed GH738[J].Rare Metal Materials and Engineering,2018,47(3):878~883.]
Deformation Characteristic and Microstructure Evolution of Spray Formed GH738
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Received:February 24, 2016  Revised:June 20, 2016
DOI:
Key words: superalloy  GH738  spray forming  constitutive model  DRX
Foundation item:国家973计划(2010CB631205);国家自然科学基金(51304177);国家科技支撑计划资助(2015BAE03B01)
Author NameAffiliationE-mail
Wang Yue Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials kurt_hit@163.com 
Xu Wenyong Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials  
Liu Na Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials  
Zheng Liang Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials  
Yuan Hua Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials  
Li Zhou Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials  
Zhang Guoqing Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials  
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Abstract:
      The hot flow behaviors and deformation model of spray formed superalloy GH738 were investigated using Gleeble-3500TM simulator at the temperature range of 950~1200℃, strain rate range of 0.13~6.5s-1 and reduction of 50%. The evolution of microstructure was studied by microscope and image analysis system. The results show that the flow stress decrease with increasing deformation temperature or decreasing strain rate. The hot deformation activation energy Q is 580.81kjmol-1. As the temperature increase, the necklace structures are obtained along the boundaries which are protuberated by the new recrystallized grains in the high dislocation-density serrated grain boundary zones. The structures show fully dynamic recrystallization characteristic at the temperature of 1100℃ while the higher temperature and the low strain rate forced the structure grown.